/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.assembler.test;

import java.util.List;

import org.apache.jena.assembler.*;
import org.apache.jena.assembler.assemblers.ModelAssembler;
import org.apache.jena.graph.GraphMemFactory;
import org.apache.jena.rdf.model.*;
import org.apache.jena.rdf.model.impl.ModelCom;
import org.apache.jena.rdf.model.test.ModelTestBase;
import org.junit.Assert;

/**
 * A model assembler that creates a model with controllable supporting of
 * transactions and aborting on adding statements; the model logs transactions and
 * adding-of-models. For testing only.
 */
final class MockTransactionModel extends ModelAssembler {
    private final List<String> history;
    private final Model expected;
    private final boolean supportsTransactions;
    private final boolean abortsOnAdd;

    protected MockTransactionModel(List<String> history, Model expected, boolean supportsTransactions, boolean abortsOnAdd) {
        super();
        this.history = history;
        this.expected = expected;
        this.supportsTransactions = supportsTransactions;
        this.abortsOnAdd = abortsOnAdd;
    }

    @Override
    protected Model openEmptyModel(Assembler a, Resource root, Mode irrelevant) {
        return new ModelCom(GraphMemFactory.createDefaultGraph()) {
            @Override
            public Model begin() {
                history.add("begin");
                Assert.assertTrue(isEmpty());
                return this;
            }

            @Override
            public Model add(Model other) {
                history.add("add");
                if ( abortsOnAdd )
                    throw new RuntimeException("model aborts on add of " + other);
                super.add(other);
                return this;
            }

            @Override
            public Model abort() {
                history.add("abort");
                return this;
            }

            @Override
            public Model commit() {
                ModelTestBase.assertIsoModels(expected, this);
                history.add("commit");
                return this;
            }

            @Override
            public boolean supportsTransactions() {
                history.add("supports[" + supportsTransactions + "]");
                return supportsTransactions;
            }
        };
    }
}
